Non-woven fabric prepreg, metal-foil-clad plate and printed circuit board

Abstract

The present invention provides a non-woven fabric prepreg, a metal-foil-clad plate and a printed circuit board. The non-woven fabric prepreg comprises a fluorine-containing resin binder non-woven fabric and a fluorine-containing resin composition, wherein the fluorine-containing resin binder non-woven fabric comprises a binder and inorganic fibers, and the binder is a fluorine-containing resin emulsion; and the fluorine-containing resin composition comprises, in parts by weight, 30-100 parts of a fluorine-containing resin emulsion, and 0-70 parts of an inorganic filler. The non-woven fabric prepreg and a copper-clad plate containing the non-woven fabric prepreg of the present invention have good dielectric properties and a low thermal expansion coefficient, such that the copper-clad plate can meet the performance requirements of the high-frequency communication field on a copper-clad plate material.

1 . A non-woven fabric prepreg, which comprises a fluorine-containing resin binder non-woven fabric and a fluorine-containing resin composition, the fluorine-containing resin binder non-woven fabric comprises a binder and an inorganic fiber, and the binder is a fluorine-containing resin emulsion; and the fluorine-containing resin composition comprises, by weight, 30-100 parts of a fluorine-containing resin emulsion and 10-70 parts of an inorganic filler. 
     
     
         2 . The non-woven fabric prepreg according to  claim 1 , wherein the fluorine-containing resin emulsion is selected from any one or a combination of at least two of a polytetrafluoroethylene emulsion, a fluorinated ethylene propylene emulsion, a polyvinylidene fluoride emulsion, a tetrafluoroethylene-perfluoroalkylvinyl ether copolymer emulsion, an ethylene-tetrafluoroethylene copolymer emulsion, a polytrifluorochloroethylene emulsion, or an ethylene-trifluorochloroethylene copolymer emulsion. 
     
     
         3 . The non-woven fabric prepreg according to  claim 1 , wherein the inorganic fiber is selected from any one or a combination of at least two of an E-glass fiber, an NE-glass fiber, an L-glass fiber, a quartz fiber, an aluminum oxide fiber, a boron nitride fiber, a silicon carbide fiber, a zinc oxide fiber, a magnesium oxide fiber, a silicon nitride fiber, a boron carbide fiber, an aluminum nitride fiber, an aluminum oxide whisker, a boron nitride whisker, a silicon carbide whisker, a zinc oxide whisker, a magnesium oxide whisker, a silicon nitride whisker, a boron carbide whisker, or an aluminum nitride whisker. 
     
     
         4 . The non-woven fabric prepreg according to  claim 1 , wherein the inorganic filler comprises any one or a combination of at least two of spherical titanium dioxide, angular titanium dioxide, spherical silicon dioxide, hollow silicon dioxide, barium titanate, strontium titanate, a short-cut glass fiber, aluminum oxide, boron nitride, silicon nitride, an aluminum oxide whisker, a boron nitride whisker, or a hollow glass microsphere. 
     
     
         5 . The non-woven fabric prepreg according to  claim 1 , wherein the inorganic filler has surface modification; 
     
     
         6 . The non-woven fabric prepreg according to  claim 1 , wherein the fluorine-containing resin composition comprises, by weight of solid, 30-50 parts of a fluorine-containing resin, 25-35 parts of titanium dioxide, and 10-20 parts of silicon dioxide. 
     
     
         7 . The non-woven fabric prepreg according to  claim 1 , wherein the fluorine-containing resin composition comprises, by weight of solid, 30-60 parts of a fluorine-containing resin, 20-40 parts of boron nitride, 4-10 parts of titanium dioxide, and 10-20 parts of silicon dioxide. 
     
     
         8 . The non-woven fabric prepreg according to  claim 1 , wherein the fluorine-containing resin binder non-woven fabric is impregnated with the fluorine-containing resin composition, dried and sintered to prepare the non-woven fabric prepreg. 
     
     
         9 . A metal-clad laminate, which comprises a metal foil and the non-woven fabric prepreg according to  claim 1 . 
     
     
         10 . A printed circuit board, which comprises at least one of the non-woven fabric prepreg according to  claim 1 . 
     
     
         11 . The non-woven fabric prepreg according to  claim 2 , wherein in the fluorine-containing resin binder non-woven fabric, a weight percentage of the inorganic fiber is 60-95%, and a weight percentage of the binder is 5-40%. 
     
     
         12 . The non-woven fabric prepreg according to  claim 2 , wherein a solid content of the fluorine-containing resin emulsion is 30-70%. 
     
     
         13 . The non-woven fabric prepreg according to  claim 2 , wherein a particle size of a fluorine-containing resin in the fluorine-containing resin emulsion is 0.10-0.40 μm. 
     
     
         14 . The non-woven fabric prepreg according to  claim 3 , wherein the inorganic fiber has an average diameter of less than 13 μm, preferably less than 10 μm, and preferably 0.5-5 μm. 
     
     
         15 . The non-woven fabric prepreg according to  claim 3 , wherein the inorganic fiber has an average length of 1-100 mm, preferably 1-10 mm. 
     
     
         16 . The non-woven fabric prepreg according to  claim 1 , wherein the fluorine-containing resin composition comprises, by weight of solid, 30-40 parts of a fluorine-containing resin, 55-70 parts of titanium dioxide, and 5-20 parts of silicon dioxide. 
     
     
         17 . The non-woven fabric prepreg according to  claim 1 , wherein the fluorine-containing resin composition comprises, by weight of solid, 40-60 parts of the fluorine-containing resin, 0-10 parts of titanium dioxide, and 40-60 parts of silicon dioxide. 
     
     
         18 . The non-woven fabric prepreg according to  claim 1 , wherein the binder further comprises an anti-foaming agent with a weight percentage of 0.01-1%. 
     
     
         19 . The non-woven fabric prepreg according to  claim 1 , wherein the fluorine-containing resin binder non-woven fabric has surface treatment, and a treating agent for the surface treatment is selected from one or a mixture of at least two of a fluorine-containing silane coupling agent, an amino silane coupling agent, an epoxy silane coupling agent, a vinyl silane coupling agent, an alkyl silane coupling agent, a borate coupling agent, a zirconate coupling agent, or a phosphate coupling agent. 
     
     
         20 . The non-woven fabric prepreg according to  claim 1 , wherein the fluorine-containing resin binder non-woven fabric has a unit weight of 20-200 g/m 2 , preferably 20-100 g/m 2 .